Connect ear and head
You will have notice, that connecting a more dense edge loop to an edge loop with less vertices will fail.



The solution is to use intermediate faces inbetween, translating the vertex count to a higher one and vice versa.



The resulting quads will subdivide well and work with deformations.



If the area won't deform or is planar (not the case with rounded/concave/convex surfaces), there is no reason not to use triangles.



The topology guides page has many useful tutorials including Optimal Edge Flow Loop Reduction featuring this visualization.